[llvm] [LoopInterchange] Enable it by default (WIP) (PR #124911)

[Michael Kruse via llvm-commits]

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@@ -201,7 +201,7 @@ static cl::opt<bool> RunNewGVN("enable-newgvn", cl::init(false), cl::Hidden,
                                cl::desc("Run the NewGVN pass"));
 
 static cl::opt<bool> EnableLoopInterchange(
-    "enable-loopinterchange", cl::init(false), cl::Hidden,
+    "enable-loopinterchange", cl::init(true), cl::Hidden,
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Meinersbur wrote:

Consider to also add switches to the clang driver like `-fvectorize`/`-fno-vectorze` and `-funroll-loops`/`fno-unroll-loops`. GCC's is called `-floop-interchange`.

https://github.com/llvm/llvm-project/pull/124911